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Reformatting of a list

Frederic Drape

Hi everybody,

I have a list that look something like that:

list1 = list(list("a" "1" "1") list("a" "1" "2") list("a" "2" "3") list("b" "5" "5") list("b" "5" "6") list("b" "7" "8"))

and I want this list to be reformatted to look like that:

list2 = list(list("a" list("1,1" "1,2" "2,3")) list("b" list("5,5" "5,6" "7,8")))


Anybody have an elegant way of doing that???

Thanks

Fred

Parents
  • dmay

    Here is one way to do it:

    list1 = list(list("a" "1" "1") list("a" "1" "2") list("a" "2" "3") list("b" "5" "5") list("b" "5" "6") list("b" "7" "8"))
    tbl = makeTable("test" nil)
    foreach(x list1 tbl[car(x)] = append1(tbl[car(x)] buildString(cdr(x) ",")))
    list2 = tableToList(tbl)

    A couple of comments about this:

    1. I try to avoid "append" and "append1" as much as possible for performance reasons. The "cons" command is usually a better choice, but it adds to the front of the list. In this case, your list is short so if we know that will always be the case, this will work.

    2. I prefer tables to complicated lists. Your list2 table looks like a key/value pair, so maybe you don't need the final "tableToList" command and can work with the table instead. Tables are much more efficient and in this case it is a cleaner simpler structure.

    3. If what you are describing has to do with lists of points, then there are more things I would change.

    I hope that helps.

    Derek

Reply
  • dmay

    Here is one way to do it:

    list1 = list(list("a" "1" "1") list("a" "1" "2") list("a" "2" "3") list("b" "5" "5") list("b" "5" "6") list("b" "7" "8"))
    tbl = makeTable("test" nil)
    foreach(x list1 tbl[car(x)] = append1(tbl[car(x)] buildString(cdr(x) ",")))
    list2 = tableToList(tbl)

    A couple of comments about this:

    1. I try to avoid "append" and "append1" as much as possible for performance reasons. The "cons" command is usually a better choice, but it adds to the front of the list. In this case, your list is short so if we know that will always be the case, this will work.

    2. I prefer tables to complicated lists. Your list2 table looks like a key/value pair, so maybe you don't need the final "tableToList" command and can work with the table instead. Tables are much more efficient and in this case it is a cleaner simpler structure.

    3. If what you are describing has to do with lists of points, then there are more things I would change.

    I hope that helps.

    Derek

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